I was all set to glue on a new tubular this weekend and found that I was out of my usual glue (Panasonic Panacement) so I used a tube of Vittoria mastic. Yecch. Glue all over the place.
I recommend Panacement but Ifm not sure if they sell it in the USA. I put a liberal coating on the rim, and none on the tire. Let it dry for a full half-hour. It will feel only the slightest bit tacky. Mount the tire and no glue will get on the sidewalls or on your hands but the tire will bond to the rim so hard that it canft be removed without a tire lever.
For removing the tire I use a single round aluminum lever and roll it under the tire, breaking the bond a few centimeters at a time.